all: import netsniff-ng 0.5.8-rc0 source

We decided to get rid of the old Git history and start a new one for
several reasons:

 *) Allow / enforce only high-quality commits (which was not the case
    for many commits in the history), have a policy that is more close
    to the one from the Linux kernel. With high quality commits, we
    mean code that is logically split into commits and commit messages
    that are signed-off and have a proper subject and message body.
    We do not allow automatic Github merges anymore, since they are
    total bullshit. However, we will either cherry-pick your patches
    or pull them manually.

 *) The old archive was about ~27MB for no particular good reason.
    This basically derived from the bad decision that also some PDF
    files where stored there. From this moment onwards, no binary
    objects are allowed to be stored in this repository anymore.

The old archive is not wiped away from the Internet. You will still
be able to find it, e.g. on git.cryptoism.org etc.

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>

1 files changed, 68 insertions, 0 deletions

diff --git a/proto_icmpv4.c b/proto_icmpv4.c
new file mode 100644
index 0000000..13f0eda
--- /dev/null
+++ b/proto_icmpv4.c
@@ -0,0 +1,68 @@
+/*
+ * netsniff-ng - the packet sniffing beast
+ * Copyright 2009, 2010 Daniel Borkmann.
+ * Subject to the GPL, version 2.
+ */
+
+#include <stdio.h>
+#include <stdint.h>
+#include <netinet/in.h>    /* for ntohs() */
+
+#include "proto.h"
+#include "protos.h"
+#include "csum.h"
+#include "dissector_eth.h"
+#include "pkt_buff.h"
+#include "built_in.h"
+
+struct icmphdr {
+	uint8_t type;
+	uint8_t code;
+	uint16_t checksum;
+	union {
+		struct {
+			uint16_t id;
+			uint16_t sequence;
+		} echo;
+		uint32_t gateway;
+		struct {
+			uint16_t ____unused;
+			uint16_t mtu;
+		} frag;
+	} un;
+} __packed;
+
+static void icmp(struct pkt_buff *pkt)
+{
+	struct icmphdr *icmp = (struct icmphdr *) pkt_pull(pkt, sizeof(*icmp));
+	uint16_t csum;
+
+	if (icmp == NULL)
+		return;
+
+	csum = calc_csum(icmp, pkt_len(pkt) + sizeof(*icmp), 0);
+
+	tprintf(" [ ICMP ");
+	tprintf("Type (%u), ", icmp->type);
+	tprintf("Code (%u), ", icmp->code);
+	tprintf("CSum (0x%.4x) is %s", ntohs(icmp->checksum),
+		csum ? colorize_start_full(black, red) "bogus (!)"
+		       colorize_end() : "ok");
+	tprintf(" ]\n");
+}
+
+static void icmp_less(struct pkt_buff *pkt)
+{
+	struct icmphdr *icmp = (struct icmphdr *) pkt_pull(pkt, sizeof(*icmp));
+
+	if (icmp == NULL)
+		return;
+
+	tprintf(" Type %u Code %u", icmp->type, icmp->code);
+}
+
+struct protocol icmpv4_ops = {
+	.key = 0x01,
+	.print_full = icmp,
+	.print_less = icmp_less,
+};